Rheology and rebound behaviour of dry-mix shotcrete

Pfeuffer, Markus; Kusterle, Wolfgang

doi:10.1016/s0008-8846(01)00614-7

Cited by 38 publications

(13 citation statements)

References 2 publications

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“…Rebound, namely the shotcrete material that does not adhere to the substrate, is associated with both shotcrete application techniques. The rebound greatly influences the economic efficiency and also the environmental impact of the production processes [6]. It can vary from 5 to 10% by mass of applied materials for wet-process and 15 to 40% for dry-process.…”

Section: Shotcrete Processesmentioning

confidence: 99%

Advancements in shotcrete technology

Bernardo

Guida

Mecca

2015

WIT Transactions on the Built Environment

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Shotcrete is a cement-based mixture pneumatically projected at high velocity onto a receiving surface. The material component of shotcrete is essentially concrete or sometimes mortar, but the process of shotcrete application is unique. This process allows a good compaction of concrete to be obtained without vibration. Compared to cast-in-place concrete, other important advantages of the shotcrete process are related to the reduction of the amount and time for formwork installation, removal, and associated labor costs, the very flexible logistics, very good working safety and good environmental conditions. Nowadays, because of the significant advances that occurred mainly in the last few decades, shotcrete can be considered a proper repair material particularly suitable in different situations such as where formwork is not practical or can be reduced or eliminated, where access to the work area is difficult, where thin layers and/or variable thickness is required and where normal casting techniques cannot be employed. This paper describes the two different application techniques of shotcrete, namely the dry-mix process and the wet-mix process, and discusses their respective advantages and disadvantages. The drawbacks of conventional shotcrete (only based on cement and aggregate mixtures) are reviewed and high performance shotcrete are presented. These novel shotcrete materials are produced through the addition of new generations of chemical admixtures, supplementary cementitious materials and reinforcement fibres. Cases histories of a successful use of the shotcrete process in the rehabilitations of architecturally important historic buildings are described.

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Section: Shotcrete Processesmentioning

confidence: 99%

Advancements in shotcrete technology

Bernardo

Guida

Mecca

2015

WIT Transactions on the Built Environment

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“…Banfill et al (1999) used the parameter of viscosity to determine fluidity of concrete in pump concrete, and the relationship between the rheology of unvibrated fresh concrete and its flow under vibration in a vertical pipe apparatus was established. Concrete rheology can also be used in some special applications; for example, Pfeuffer and Kusterle (2001) established a correlation between the rheological characteristics and the rebound of dry-mix shotcrete, which allowed a simple, fast assessment to be made of the effect of individual admixtures or additives in minimizing rebound in the laboratory before conducting any spray experiments at construction site.…”

Section: Introductionmentioning

confidence: 99%

A study of effects of aggregate on concrete rheology

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The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleed-through, substandard margins, and improper alignment can adversely affect reproduction. In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion.

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“…Rebound which is described as that part of the sprayed material (consisting of sand, cement and mainly of coarse aggregate) that has not adhered to the substrate or failed to cling to the surface and has fallen [11][12] is an important element in the spraying application. The rebound effect as an indirect measure of the quality of shotcrete is expressed as the ratio of the mass of concrete loss caused by rebound to the total mass of concrete.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Rebound Amount in Dry Mix Shotcrete by a Fast Adaboosting Neural Network

2021

Teh. vjesn.

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In this study, a new machine learning approach has been proposed to predict the rebound causing loss of material in shotcrete using the ensemble learning method. In shotcrete application, the amount of rebound material was obtained for use in a dataset. In this study, the shotcrete mixes that contain an additive of fly-ash, silica fume, and polypropylene fiber were produced besides simple shotcrete. Each mix was sprayed onto 2 wooden panels measuring 45 × 45 × 15 cm in size. The rebound material resulting from the spraying process was collected, weighed and recorded as data. The highest rebound was observed for the plain sample and the lowest for samples with substituted silica fume. Dependent and independent parameters were identified in the dataset produced as a result of experimental studies. Hyperparameters producing optimum results in the training of the model were identified for the model and boosting method. The dataset was split into training and testing sets by 80% and 20%, respectively. As a result, the model achieved a prediction performance of 84.25%. To test the performance of the proposed model, traditional machine learning algorithms were compared on the same dataset. Consequently, the proposed model was observed to have the highest accuracy.

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Rheology and rebound behaviour of dry-mix shotcrete

Cited by 38 publications

References 2 publications

Advancements in shotcrete technology

Advancements in shotcrete technology

A study of effects of aggregate on concrete rheology

Prediction of Rebound Amount in Dry Mix Shotcrete by a Fast Adaboosting Neural Network

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